using UnityEngine.SceneManagement;

if (count > 100) {
   SceneManager.LoadScene("SceneName");
}

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class Test : MonoBehaviour
{
    public Text countText;
    int globalCount = 0;

    public static Test current;

    void Start ()
    {
       current = this;
    }

    public void IncrementCount ()
    {
       globalCount++;
       countText.text = globalCount.ToString ();
       print(globalCount);
    }
}

void GetPunch ()
{
    counter--;

    print (counter);
    if (counter <= 0) {
         count = count + 1;
         Test.current.IncrementCount ();
         Destroy (gameObject);
    }
}

void Start () {
   
   ///
   print ("countText содержит: " + countText);
}

countText = GetComponent<Text>();

void GetPunch() {
   counter--;

   print (counter);
   if (counter <= 0) {
      count = count + 1;
      countText.text = count.ToString ();
      Destroy (gameObject);
   }
}

using UnityEngine;
using System.Collections;

public class LinerMovement : MonoBehaviour, IMovement {
    bool IsAlreadyFired = false;

    public void Move(GameObject entity)
    {
        if (!IsAlreadyFired)
        {
            
            //entity.transform.Translate(entity.transform.up * Time.deltaTime); // не понятное направление
            //entity.GetComponent<Rigidbody2D>().AddForce(entity.transform.up * 1000); // всё работает как нужно
            //IsAlreadyFired = true;
        }
    }
    void Update () {
      transform.position += transform.up * Time.deltaTime;
    }
}